[Texas Fossil]

Seeing that natural gas contains approximately 1,030 BTU per cubic foot and propane contains 2,490 BTU per cubic foot, we can easily derive each fuel's cost per BTU and compare their differences in price for more realistic volumes.

So propane has roughly 2.5 times the BTU's per cu. ft. of gas. But it cost more per cu. ft. You will have to do the math on price comparison.

[Paladin2]

Why are Propane BTUs more expensive? How do they compare to Diesel BTUs